Lacie 500gb with disappearing files?

System: I am running my Lacie 500gb (porsche design) wirelessly through an Apple Airport Extreme and accessing them on my Powerbook G4. Lacie is connected to AE through USB, and has 377gb worth of data, no partitions.

What happened: I tried to put a very small .srt file on the hard drive, but it kept giving an error message, "Cannot copy file blah blah... file name too long or contains characters unreadable" or something to that effect. After a number of attempts it FINALLY appeared to load.

Problem: Now when I access my Lacie wirelessly all file and folder icons disappear after a millisecond, but the drive info still says 377gb used. If I connect to the Lacie through USB the icons are as they should be, except the problem .srt file only appears as the name with no icon. If I click on the .srt file that one file disappears, so I can't delete it, open it, or do file repair on it.